Coaxial plug connector

ABSTRACT

The specification describes a coaxial plug connector, preferably for air-space insulated cable, and which is adapted to be sealed by means of self-curing synthetic resin injected into annular sealing chambers. The connector comprises a cable attachment part which is provided with annular grooves. These grooves form the annular sealing chambers and are connected with each other and with a filling opening by radial slots.

United States Patent 1191 Spinner COAXIAL PLUG CONNECTOR lnventor: Georg Spinner, Erzgie bereistr. 33, 8 Munchen 2, Germany Filed: Mar. 6, 1973 Appl. No.: 338,452

[30] Foreign Application Priority Data Mar. 9, 1972 Germany 2211466 us. c1. 174/75 0, 174/21 (3, 174/89, 339/89 c, 339/177 E 511 Int. Cl H02g 15/04, H011 13/36 Field of Search 174/21 1c, 21 c, 21 CA, 174/22 c, 75 c, 88 c, 89; 339/60 (3, 89 c,

94 c, 177 R, 177 E References Cited FOREIGN PATENTS OR APPLlCATlONS 1,090,288 10/1960 Germany 174/75 C Primary Examiner-Laramie E. Askin Attorney, Agent, or FirmOstrolenl Faber, Gerb Sofi'en [5 7] ABSTRACT The specification describes a coaxial plug connector, preferably for air-space insulated cable, and which is adapted to be sealed by means of self-curing synthetic resin injected into-annular sealing chambers. The connector comprises a cable attachment part which is provided with annular grooves. These grooves form the annular sealing chambers and are connected with each other and with a filling opening by radial slots.

10 Claims, 2 Drawing Figures 1 COAXIAL PLUG CONNECTOR The invention relates to a coaxial plug connector,

. preferably fo'r air-space insulated cables, which is adapted to be sealed with respect to the cables by means of self-curing synthetic resin which can be injected into annular sealing chambers.

In the case of such cable plug connectors the sealing of the plug connector with respect to the cable must be undertaken at two positions which are axially spaced. On the one hand sealing must be provided between the front part of the plug connector in order'to provide for a completely gas and-water tight connection between the line parts when the plug connection has been made, and on the other hand it is necessary to provide a seal between the plug connector and the outer casing of the cable in order. to prevent penetration of moisture between the outer cable conductor and the cable casing.

Sealing measureswhich only provide for a sealing action between the plug connector and the protective casing of the cable are not reliable because the casing consisting of synthetic resin tends to creep or-flow.

One aim of the present invention is to bring about this double sealing action by means of anelastic selfment part passes to the 'two axially spaced annular chambers and the front annular chamber brings about a formation of a seal between the front part of the plug connector and the'cable clamping means and the rear sealing chamber ensures the formation of a'seal between the cable tube, more particularly a'corrugated tube, and the cable grippingmeans. In the case of a corrugated tube cable the cable gripping means is in the form ofa nut adapted for use with corrugations. lnthis manner a reliable and permanent seal is provided for between the plug connector and the outer conductor of thecable, more particularly the corrugated tube outer conductor. Simultaneously the composition injected into the rear sealing chamber also brings about the formation of a sealingmeans between the protective cable casing and the plug connector.

The cable attachment part is preferably constructed as a clamping ring, which can be slid onto the cable ing opening through the slots within the 'cable'attachan insulating support means. This contact ring preferably has a radial hole for the passage of a gas filling, and the front part of the plug connector has a gas filling opening provided at this position.

In what follows an embodiment of the invention will be described with reference to the drawing.

FIG. 1 is an axial half section of a coaxial plug connector in accordance with the invention and fixedon a corrugated tube cable.

FIG. 2 shows a half section of the corrugated tube nut on a larger scale.

The coaxial plug connector consists of a plug connector head 1, on which a clamping nut 3 is screwed. The rear part of the nut fits around the outer casing 5 of the cable. A cable attachment part constructed in the form of a cable gripping part 2 is surrounded partly by the rear end of the plug connector head 1 and partly by the front end of the nut 3. In the case of the construction shown of the cable tube as a corrugated tube the cable gripping means is constructed as a corrugated tube nut and is screwed on the corrugated tube. The front end of this corrugated tube is flared or broadened out to I form a contacting flange 10, which lies on the front end ring surface of the corrugated tube nut 2. By axially clamping the parts 1 and 3 the corrugated tube nut,- supported axially in a positive manner by the nut 3, is clamped against the contacting flange 10 of the outer conductor against a contacting ring 9, which for its part is held or supported positively in an axial direction in the plug connector head. The corrugated tube nut 2 has a rear annular gro0ve4, which forms the rear sealing chamberbetween the corrugated tube and the corrugated tube nut 2. An outerannular groove 6, located in the central section of the cable gripping means 2, forms the front annular sealing chamber between the corrugated tube nut2 and the plug connector. Aligned with the front annular groove axially there is a filling jection or forcing-in of a self-curing duro-elastic syn-' thetic resin. The filling opening is connectedvwith the I annular front-sealing space 6 and with the rear annular tube forming the outer conductor or can be screwed on in the case of a corrugated tube and can be clamped byv means of a screw connection between the front part of the plug connector and the rear part of the plug connector in an axial direction and clamps the crimped over end ring surface of the cable outer conductor or of the cable tube so as to make axial contact.

The clamping action is preferably carried out in this case by means of a contact ring, which is supported from the front on the crimped over end ring contacting face and preferably serves simultaneously for receiving sealing space 4 via connecting conduit or radial slots 8 in the corrugated tube nut 2. Via these slots 8 the synthetic resin composition injected in through the opening can pass into both annular sealing chambers so as to guarantee completely satisfactory sealing at both of the critical positions coming into question. In FIG. 1 the sealing composition has been omitted in order to aid intelligibility.

At the same level as the contact ring 9 there is a gas connection opening with a closing screw 11 and at the same level as this opening the contacting ring 9 has'one or more radial gas'p'assage openings 12.

The contact ring 9 surrounds an insulating support means 13, which to the. front rests axially against a step in the plug connector head, and to the rear rests against a step in the contacting ring 9. This insulating support member 13 receives the inner conductor 14, which is made integrally and has a screw thread 15 by means of which it is screwed into. the internal conductor of the cable. In the case of an integral construction of the plug nal key member 16 which through the plug Connector head 1.

accessible frojrnthe front '1 is slipped overthe' corrugated tubenut 2 and the nut 3 is screwed onto the plug c'onnector head; after screwing the inner conductor section 14 into the internal conductor of the cable. f v

In: accordance with a-furth'er form of the invention the insulating supporting me mber 13 is injected'b etween the contact ring 9 and the internal conductor of the entire said plug connectorinto said attachment part periphery groove; 'said attachment part cablefacing side being provided 7 witha groove thatco'rnmunicates with said cable;

a connecting conduit between said periphery groove and jsaid cable facing side groove for enabling transmission of a sealing means from said filling opening into said grooves. 1 i 2. A plug connector according to claim '1, wherein both said periphery groove and said cable'facing side groove are annular, thereby-to enable sealing of said attachment part with sealing means.

section so that-a sealed component is produced which can'be fitted inbeforemounting the head 1 of the plug connector. 1-

' Following this, sealing composition is injected through the. filling opening and this'com po'sition becomes distributed evenly amongst the annular sealing spaces and the slots. After injection of the sealing composition, the closing screw 7 of the-opening is screwed home again. Via the pressure connection sealed by the closing screw 11 the space between the inner conductor and the outer conductor can be filled with a suitable gasi Whatl'claimisr v 1.A plug connector for coaxial cables, comprising:

- a cable comprising an internal conductor and an external conductor positioned around said internal conductorand spaced therefrom; said cable exterv nal conductor having a free endsection; a plugconnector-head which has an internal conductor therein and which'has anext'ernal conductor therein that is around its said internal and is spaced therefrom; said cable internal'conductor and said plug connector head internal conductor being electrically connected; said cable external conductor and said plug connector head external conductor being electrically connected; cable attachment part interposed between said cable and said plug connector head; said cable internal conductor passing through said attachment part; said cable external conductor also passing through said attachment part and its said free end section being supported against said attachment part near said plug connector head external conductor; 4 said'attachment part having a cable facing side which faces toward said cable and having an annular periphery; means connectedwith said cable and a portion of said plug connector head both passing around said attachment part periphery; said attachment part periphery being provided with a groove that com- .rnunicates with said plug connector head portion; a filling opening communicating from the exterior conductor 3. A plug connector in accordance with claim 2,

wherein a sealing resin is deposited in said grooves and passes through 'said conduit between said grooves, thereby toseal-said cable to said plug connector.

4. A plug connector according to claim 2, wherein there are a plurality 'of said connecting conduits and 'they extend radially inwardly of said plug connector and between said grooves.

5. A plug'connector according to claim 4,'wher'ein said plug connector head inner conductor is fastened to said cable inner conductor by means of the former being screwed into the latter; said plug connector head inner conductor having a tightening means for tightening it against said cable inner conductor.

6. A plug connector according 'to claim 2, wherein said cable attachment part includes means which grip said. cable and said 5 cable external conductor; said means connected with said cable beinga-nut attached to said cable, saidlnut clamping said attachment part against-said plug connector head and axially pressing said cable external conductor which is gripped by said attachment part toward said plug connector head.

7. A plug connector according to claim 6', wherein said attachment parthas a front face facing toward said plug connector head;-said cable outer conductor free end section. being crimped over said attachment part front face;

said plug connector head external conductor comprising an electric contact ring in said plug connector head which is positioned to engage said cable outer conductor free end section and is clamped thereagainst. I g

8. The plug connector of claim 7, further comprising an insulating support member interposed between said plug connector head electric contact ring and its said internal conductor.

9. A plug connector according to claim 8, wherein a radial passage is formed through said electric contact 'ring,'and said plug connector has a filler opening therethrough communicating with said electric contact ring opening; closing means for said plug connector filler opening. I

10. A plug connector according to claim 8, wherein said insulating support member is of a thermoplastic material and is closely fitted on said plug connector head internal conductor. 

1. A plug connector for coaxial cables, comprising: a cable comprising an internal conductor and an external conductor positioned around said internal conductor and spaced therefrom; said cable external conductor having a free end section; a plug connector head which has an internal conductor therein and which has an external conductor therein that is around its said internal conductor and is spaced therefrom; said cable internal conductor and said plug connector head internal conductor being electrically connected; said cable external conductor and said plug connector head external conductor being electrically connected; a cable attachment part interposed between said cable and said plug connector head; said cable internal conductor passing through said attachment part; said cable external conductor also passing through said attachment part and its said free end section being supported against said attachment part near said plug connector head external conductor; said attachment part having a cable facing side which faces toward said cable and having an annular periphery; means connected with said cable and a portion of said plug connector head both passing around said attachment part periphery; said attachment part periphery being provided with a groove that communicates with said plug connector head portion; a filling opening communicating from the exterior of the entire said plug connector into said attachment part periphery groove; said attachment part cable facing side being provided with a groove that communicates with said cable; a connecting conduit between said periphery groove and said cable facing side groove for enabling transmission of a sealing means from said filling opening into said grooves.
 2. A plug connector according to claim 1, wherein both said periphery groove and said cable facing side groove are annular, thereby to enable sealing of said attachment part with sealing means.
 3. A plug connector in accordance with claim 2, wherein a sealing resin is deposited in said grooves and passes through said conduit between said grooves, thereby to seal said cable to said plug connector.
 4. A plug connector according to claim 2, wherein there are a plurality of said connecting conduits and they extend radially inwardly of said plug connector and between said grooves.
 5. A plug connector according to claim 4, wherein said plug connector head inner conductor is fastened to said cable inner conductor by means of the former being screwed into the latter; said plug connector head inner conductor having a tightening means for tightening it against said cable inner conductor.
 6. A plug connector according to claim 2, wherein said cable attachment part includes means which grip said cabLe and said cable external conductor; said means connected with said cable being a nut attached to said cable, said nut clamping said attachment part against said plug connector head and axially pressing said cable external conductor which is gripped by said attachment part toward said plug connector head.
 7. A plug connector according to claim 6, wherein said attachment part has a front face facing toward said plug connector head; said cable outer conductor free end section being crimped over said attachment part front face; said plug connector head external conductor comprising an electric contact ring in said plug connector head which is positioned to engage said cable outer conductor free end section and is clamped thereagainst.
 8. The plug connector of claim 7, further comprising an insulating support member interposed between said plug connector head electric contact ring and its said internal conductor.
 9. A plug connector according to claim 8, wherein a radial passage is formed through said electric contact ring, and said plug connector has a filler opening therethrough communicating with said electric contact ring opening; closing means for said plug connector filler opening.
 10. A plug connector according to claim 8, wherein said insulating support member is of a thermoplastic material and is closely fitted on said plug connector head internal conductor. 